Combination center punch and scribing gauge



Jan. 9, 1962 B. GODMAN v COMBINATION CENTER PUNCH AND SCRIBING GAUGE Filed Oct. 28. 1959 llll/l/IA INV ENT OR.

' BURNETT Goon/w A T TORNE Y5 ilnited States Patent 3,015,889 CGMBWATIQN CENTER PUNCH AND SCRBEIG GAUGE Burnett Godman, 512 12th Ave. 5., Minneapolis, Minn.

Filed Get. 23, 1959, Ser. No. 849,273 Claims. (Cl. 3327) This invention relates generally to center punches and scribing tools, and more particularly to a new and useful combination center punch and scribing gauge.

An object of my invention is the provision of a combination center punch and scribing gauge associated with a graduated scale and having sumcient versatility to be extremely useful as either a center punch gauge or a scribing gauge.

A further object of my invention is the provision of a combination center punch and scribing gauge which is quickly adjustable so as to indicate exactly the distance from any given point to the punching or scribing point.

A still further object of my invention is the provision of a combination center punch and scribing gauge which is pmticularly useful in punching a series of punch marks parallel to the edge of the material desired to be drilled.

Another object of my invention is the provision of a combination center punch and scribing gauge in which the center punch is disposed so as to allow for repeated sharpening operations without impairing its workability and in which said device is economical to manufacture and simple to operate.

The above and still further objects of my invention will become apparent from the following detailed specification, appended claims and attached drawings.

Referring to the drawings wherein like characters indicate like parts throughout the several views:

FIG. 1 is a view in perspective of the device constructed in accordance with my invention;

FIG. 2 is a view in vertical section taken on the line 22 of FIG. 1;

FIG. 3 is a perspective view of a modified form of my invention; and

FIG. 4 is a view in vertical section taken on the line 44 of FIG. 3.

Referring with greater particularity to the drawings, the reference numeral 1 represents generally a graduated scale bar having a longitudinal slot 2 which defines a guideway 3 and divides the bar 1 into two parallel side portions 4 and 5. The bar 1 at one of its ends terminates in an arcuate head portion 6 having a centrally located threaded aperture 7, the axis of which is normal to the plane of the bar 1. The bar 1 may be of any convenient and suitable length and is preferably formed of steel or other durable material, as is the remainder of the device. The bar 1 is formed to provide longitudinal outwardly reading graduations, shown generally by the numeral 8, on both of its side portions 4, 5. The graduations S begin at the axis of the aperture 7 and read laterally therefrom.

Screw threaded within said head portion 6 is a center punch, indicated generally by the numeral 9, having a point 10 and being threaded as at 11. The axis of the punch 9 is coincidental with the axis of the apertured head portion 6. A lock nut 12 is screwed on said punch 9 and is jammed against said head portion 6. Also receivable on said punch 9 is a striking block 13 which is axially drilled and threaded, as at 14, for a substantial portion of its axial length. The end 15 of said block 13 opposite its internally threaded end provides a striking surface for the application of a hammer blow when the punch mark is desired. The fact that the punch 9 and the striking block 13 are threaded for an extended length allows the point 19 of the punch 9 to be repeatedly reground without shortening the length of the punch 9 which is exposed.

For the purpose of providing a second gauging means in addition to the scale bar, a guide flange indicated generally by the numeral 16 is disclosed. The guide flange 16 includes a bifurcated plate portion 17 which defines a slot 18. The slot 18, which is receivable around said punch 9, allows lateral adjustment of the guide flange 16. The plate portion 17 of the guide flange 16 is removably secured between said head 6 and the striking block 13 on a plane generally parallel to the plane of said bar 1 whereby said guide flange 16 is snugly secured by tightening said striking block 13 against said head 6. Depending from said plate portion 17 of said guide flange 16 is a flange portion 19 which is disposed in a plane parallel to the axis of said center punch 9. Since the head portion 6 of the bar 1 is arcuate, the guide flange 16 is radially and circumferentially adjustable as desired.

Mounted and guided within said guideway 3 is a longitudinally adjustable indicating pin represented generally by the numeral 20. The portion of said indicating pin 20 opposite its point 22 is threaded as at 21. The point 22 of said indicating pin 2! depends from the same surface of said bar 1 as the point 10 of the center punch 9, and the axis of said indicating pin 20 is normal to the plane of said bar 1. In order that the indicating pin 20 may be locked in a preselected longitudinal position within said guideway 3, the locking means indicated generally by the numeral 23 is provided. The said means 23 includes a lock nut 24 receivable on the threaded portion 21 of said indicating pin 20 and disposed on the surface of said bar 1 nearest the point 22 of said indicating pin 20. Loosely receivable on said indicating pin 20, and disposed on the surface of said bar 1 opposite the last said surface, is a locking plate indicated generally by the numeral 25 and having a centrally located aperture 26 therein. The locking plate 25 comprises a flat portion 27 having said aperture 26, and a pair of depending ears 2% projecting into said guideway 3 on both longitudinally spaced sides of said fiat portion 27, and a pair of scale pointers 29 associated with the said flat portion 27. The plane of said cars 28 is normal to the plane of said bar 1 and also normal to the path of travel defined by said guideway 3. The ears 28 perform the function of maintaining said indicating pin normally aligned with the plane of the bar 1, and also keep the scale pointers normally aligned with said guideway 3. The points 30 of said scale pointers 29 lie in a plane passing through the axis of said indicating pin 29 and normal to the path of travel defined by said guideway 3. The scale pointers 29 indicate exactly the distance, as shown on the scale bar 1, from the point 10 of the punch 9 to the point 22 of said indicating pin 26. Also included as 'a part of said locking means 23 is a coiled compression spring 31 receivable on said indicating pin 20 and disposed on the side of said locking plate 25 opposite that communicating with said bar 1. Also receivable on said indicating pin 20, and disposed on the side of said spring 31 opposite that com municating with said locking plate 25, is a Wing nut 32 which secures the above described locking means 23 together.

FIGS. 3 and 4 disclose a modified form of my invention in which elements identical with those in the first disclosed embodiment are indicated by the same reference numeral with a prime mark added thereto. The modified form includes a slotted scale bar 1' defining a guideway 3'. The bar 1 terminates at one of its ends in an arcuate head portion 6' having a centrally located threaded aperture 7'. Screw threaded within said head portion 6' is a threaded center punch 33 having an integrally formed striking block 34. A lock nut 12 is screwed on said punch 33 and jammed against said head portion 6'. Mounted and guided within said guideway 3 is a longitudinally adjustable indicating pin 29' having a threaded portion 21', a point 22' and locking means 23. The locking means 23' comprises a lock nut 24, a locking plate 25' which includes a pair of depending ears 28' and a pair of scale pointers 29', a coiled compression spring 31, and a wing nut 32. The guide flange 16 of the first disclosed embodiment is not shown with the modified form, but may be'used therewith. Although this modification, as shown, limits to a small degree the versatility of my invention, the structure is also more economical to manufacture.

Although my invention is extremely versatile in the range of uses to which it may be applied, one of its more important uses is for punching a series of center punch marks which are a spaced distance from the edge of the work piece material and also a spaced distance from each other. The guide flange 16 is set so that it corresponds to the desired distance from the edge of the material to the center line of the series of marks to be punched. Then, with the indicating point 20 set to correspond to the desired distance between the punch marks, the complete series of marks can be easily and quickly punched merely by moving the indicating point 29 ahead to the mark just punched and repeating the operation.

My invention is also useful in compass fashion for punching radially spaced or circumferentially spaced marks about a given point. Of course, my invention can also be used as a scribe. By using the guide flange 16 as above described a pair of parallel lines may be scribed in spaced relationship to the edge of the material or to another reference line. Again, by using the device in compass fashion circumferential lines may be scribed about a given point.

This invention has been thoroughly tested and found to be completely satisfactory for the accomplishment of the above objects; and while I have shown preferred embodiments thereof, I wish it to be specifically understood that same may be modified without departure from the scope and spirit of the appended claims.

What I claim is:

1. In a combination center punch and scribing gauge, a longitudinally slotted scale bar defining a guideway, said bar terminating in a head having a threaded aperture the axis of which is normal to the plane of said bar, a threaded center punch screw threaded within said head and having a depending point, the aXis of said punch being coincidental with the aforesaid axis, a lock nut on said punch and engaging said head, an axially drilled and internally threaded striking block threaded on said punch, a laterally adjustable generally L-shaped guide flange removably secured to said punch and depending therefrom normal to the plane of said bar, a longitudinally adjustable indicating pin mounted and guided within said guideway, said indicating pin having a point depending from the same surface of said bar as the point of said center punch and the axis of said indicating pin being normal to the plane of said bar, and means associated with said indicating pin for releasably locking same in a preselected position longitudinally of said scale bar.

2. The structure define-d in claim 1 in which said means associated with said indicating pin for locking same in said position comprises a threaded portion on said indicating pin opposite the point thereof, a lock nut on said indicating pin disposed on the surface of said bar nearest the point of said indicating pin, an apertured locking plate loosely receivable on said indicating pin and disposed on the surface of said bar opposite the aforesaid surface, a coiled compression spring receivable on said indicating pin and disposed on the side of said locking plate opposite that communicating with said bar, and a Wing nut rec ivahle on said indicatin pin and disposed on the side of said spring opposite that communicating with said locking plate.

3. The structure defined in claim 2 in which the side of said cale bar opposite that nearest the point of the indicating pin is graduated, said graduations beginning at the axis of said center punch.

4. The structure defined in claim 3 in which said locking plate comprises an apertured fiat portion disposed on the surface of said bar opposite that nearest the point of said indicating pin, a pair of depending ears projecting into said guideway on both longitudinally spaced sides of said fiat portion, the plane of said cars being normal to the plane of said bar and normal to the path of travel defined by said guideway, and a pair of scale pointers associated with said flat portion of said locking plate, the points of said scale pointers lying in a plane passing through the axis of said indicatin pin and normal to the path of travel defined by said guideway,

5. In a combination center punch and scribing gauge, a longitudinally slotted scale bar defining a guideway, said bar terminating in a head havin a threaded aperture the axis of which is normal to the plane of said bar, a threaded center punch screw threaded within said head and having a depending point, the axis of said punch being coincidental with the aforesaid axis, a lock nut on said punch and engaging said head, an axially drilled and internally threaded striking block threaded on said punch, a laterally adjustable guide flange removably secured to said punch and depending therefrom normal to the plane of said bar, said guide flange comprising a bifurcated plate portion disposed between said head and said striking block on a plane parallel to the plane of said bar whereby said guide flange is snugly secured *by tightening said striking block against said head, said guide flange further comprising a depending flange portion the plane of which is parallel to the axis of said center punch, a longitudinally adjustable indicating pin mounted and guided Within said guideway, said indicating pin having a point depending from the same surface of said bar as the point of said center punch and the axis of said indicating pin being normal to the plane of said bar, the side of said scale bar opposite that nearest the point of said indicating pin being graduated, said graduations beginning at the axis of said center punch, and means associated with said indicating pin for releasably locking same in a preselected position longitudinally of said scale bar, said means comprising a threaded portion on said indicating pin opposite the point thereof, a lock nut on said indicating pin disposed on the surface of said bar nearest the point of said indicating pin, an apertured locking plate loosely receivable on said indicating pin and disposed on the surface of said bar opposite the aforesaid surface, a coiled compression spring receivable on said indicating pin and disposed on the side of said locking plate opposite that communicating with said bar, and a wing nut reecivable on said indicating pin and disposed on the side of said spring opposite that communicating with said locking plate, said locking plate comprising an apertured flat portion disposed on the surface of said bar opposite that nearest the point of said indicating pin, a pair of depending ears projecting into said guideway on both longitudinally spaced sides of said flat portion, the plane of said ears being normal to the plane of said bar and normal to the path of travel defined by said guideway, and a pair of scale pointers associated with said flat portion of said locking plate, the points of said scale pointers lying in a plane passing through the axis of said indicating pin and normal to the path of travel defined by said guideway.

References Cited in the file of this patent UNITED STATES PATENTS 677,339 Comstock July 2, 1901 6 OLeary Nov. 21, 1911 Hollingsworth July 2, 1912 Hoefle May 23, 1916 Menin et al May 20, 1919 Wallerius Feb. 27, 1934 Howard et a1 Aug. 22, 1950 Sosdian Oct. 10, 1950 Winter Mar. 4, 1952 

